From: Amir Goldstein <amir73il@gmail.com>
Date: Mon, 22 Apr 2024 06:40:08 +0000 (+0300)
Subject: fuse: verify zero padding in fuse_backing_map
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=aef8acd79f363ced098cd3bcde0a5978a52607ad;p=users%2Fjedix%2Flinux-maple.git

fuse: verify zero padding in fuse_backing_map

To allow us extending the interface in the future.

Fixes: 44350256ab94 ("fuse: implement ioctls to manage backing files")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---

diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c
index 1567f0323858..9666d13884ce 100644
--- a/fs/fuse/passthrough.c
+++ b/fs/fuse/passthrough.c
@@ -225,7 +225,7 @@ int fuse_backing_open(struct fuse_conn *fc, struct fuse_backing_map *map)
 		goto out;
 
 	res = -EINVAL;
-	if (map->flags)
+	if (map->flags || map->padding)
 		goto out;
 
 	file = fget(map->fd);